Stuck on Black Screen after reboot

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http://forums.androidcentral.com – Hi, I have a rooted Nexus S 4G and I was in the process of installing a new rom using TWARP. I did all the usual things like factory wipe, delvak cache wipe etc. and then flashed the zip file and rebooted my phone. My phone rebooted to the Google screen with the unlocked icon and then went to the black screen. The navigation buttons are lit up but I don't get an animation screen or anything else. I tried several battery pulls and went back into recovery and tried wiping and installing the rom , but with the same results. I then flashed touch clockwork mod and wiped my phone again and tried rei (HowTos)